PURPOSE: A composition containing a Galla rhois extract for improving cognitive ability and preventing or treating dementia is provided to show an immunomodulatory ability and to improve immune functions. CONSTITUTION: A pharmaceutical composition for preventing and treating dementia contain a Galla rhois extract as an active ingredient. A health food composition for preventing and treating dementia contains the extract as an active ingredient. A pharmaceutical composition for improving cognitive ability contains the extract as an active ingredient. A health food composition for improving cognitive ability contains the extract as an active ingredient. A pharmaceutical composition for enhancing immunity contains the extract as an active ingredient. A health food composition for enhancing immunity contains the extract as an active ingredient.본 발명은 오배자 추출물을 유효성분으로 포함하는 인지력 개선 조성물에 관한 것으로 더욱 상세하게는 오배자 추출물을 유효성분으로 포함하는 치매(alzheimer's disease； AD) 예방 및 치료용 조성물에 관한 발명이다.
